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Detailed Reference Information |
Vidale, J.E., Goes, S. and Richards, P.G. (1995). Near-field deformation seen on distant broadband seismograms. Geophysical Research Letters 22: doi: 10.1029/94GL02893. issn: 0094-8276. |
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Although far-field body waves and surface waves are widely recognized, the improvements in broadband networks now allow the measurement of ''near-field'' deformation of large earthquakes at great distances. Near-field motions have been recognized previously only in theory and in close-in recordings of earthquakes. We show examples from two recent events. For the large deep event on June 9, 1994 in Bolivia, there is a clear offset after the arrival of the P wave that has the amplitude expected for the near-field term. In the shallow September 2, 1992 Nicaragua earthquake, the very long-period motion observed between the P and S waves has roughly the amplitude expected from near-field terms. Such near-field terms are insensitive to earth structure, but supply information on long-period source processes, and their observation begins to close the gap between long-period seismology and geodesy. ¿ American Geophysical Union 1995 |
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Abstract |
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Keywords
Seismology, Earthquake parameters, Seismology, Instruments and techniques |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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